http://www.perlmonks.org?node_id=146516
Description: Ok, I got inspired while converting my MP3 collection to Ogg Vorbis. Here's a few oneliners I used.
Convert all MP3's in directories given to it.
perl -e 'while(<>){chomp;print "*** $_ ***\n";chdir"$_";system "mp32og
+g --maxbitrate 128 *.mp3";}'

Clean up any duplicate messes in current directory that may belong someplace else.

perl -e 'while(<>){chomp;@z=`find . -name "$_"`;unlink $_ if($#z);}' <
+ temp.txt